CODEWITHSUNDEEP
bazel
erenon
erenon

Reputation: 19118

Force Bazel to use local java only

I'd like to use bazel in a locked-down environment, one without uncontrolled internet access. I'd like to force bazel to use the locally installed java, instead of downloading one. I could not figure out the required combination of flags - this is what I tried:

$ java -version
java version "1.8.0_171"
Java(TM) SE Runtime Environment (build 1.8.0_171-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.171-b11, mixed mode)
$ javac -version
javac 1.8.0_171
$ bazel clean --expunge
$ bazel info release
release 0.24.1
$ bazel build //hello 
# This builds a 'hello world' cpp file.
# This rule also downloads some rules, would be nice to avoid it as
INFO: Build completed successfully, 6 total actions well
$ bazel test --nofetch //hello:hello_test
ERROR: /home/erenon/.cache/bazel/_bazel_erenon/afacf41c7e3fc3f4ea7510d344b4de38/external/bazel_tools/tools/jdk/BUILD:218:1: no such package '@remote_java_tools//': to fix, run
        bazel fetch //...
External repository @remote_java_tools not found and fetching repositories is disabled. and referenced by '@bazel_tools//tools/jdk:JacocoCoverageRunner'
ERROR: Analysis of target '//hello:hello_test' failed; build aborted: no such package '@remote_java_tools//': to fix, run
        bazel fetch //...
External repository @remote_java_tools not found and fetching repositories is disabled.
INFO: Elapsed time: 0.160s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (3 packages loaded, 27 targets configured)
FAILED: Build did NOT complete successfully (3 packages loaded, 27 targets configured)

I get the same results with a more intricate command line:

$ bazel test --nofetch --define=ABSOLUTE_JAVABASE=/usr/lib/jvm/java-8-openjdk-amd64 --host_javabase=@local_jdk//:jdk --javabase=@local_jdk//:jdk --host_java_toolchain=@bazel_tools//tools/jdk:toolchain_hostjdk8 --java_toolchain=@bazel_tools//tools/jdk:toolchain_hostjdk8 //hello:hello_test
INFO: Build options --define, --host_java_toolchain, --host_javabase, and 2 more have changed, discarding analysis cache.
ERROR: /home/erenon/.cache/bazel/_bazel_erenon/afacf41c7e3fc3f4ea7510d344b4de38/external/bazel_tools/tools/jdk/BUILD:218:1: no such package '@remote_java_tools//': to fix, run
        bazel fetch //...
External repository @remote_java_tools not found and fetching repositories is disabled. and referenced by '@bazel_tools//tools/jdk:JacocoCoverageRunner'
ERROR: Analysis of target '//hello:hello_test' failed; build aborted: no such package '@remote_java_tools//': to fix, run
        bazel fetch //...
External repository @remote_java_tools not found and fetching repositories is disabled.
INFO: Elapsed time: 0.215s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (0 packages loaded, 50 targets configured)
FAILED: Build did NOT complete successfully (0 packages loaded, 50 targets configured)

I tried every combination of the java flags, no luck. I also tried to enable every incompatible change (--all_incompatible_changes), which yields to a different result:

INFO: Build options --incompatible_allow_python_version_transitions, --incompatible_auto_configure_host_platform, --incompatible_cc_coverage, and 24 more have changed, discarding analysis cache.
ERROR: While resolving toolchains for target //hello:hello_test: com.google.devtools.build.lib.packages.BuildFileNotFoundException: no such package '@local_config_platform//': to fix, run
        bazel fetch //...
External repository @local_config_platform not found and fetching repositories is disabled.
ERROR: Analysis of target '//hello:hello_test' failed; build aborted: com.google.devtools.build.lib.packages.BuildFileNotFoundException: no such package '@local_config_platform//': to fix, run
        bazel fetch //...
External repository @local_config_platform not found and fetching repositories is disabled.
INFO: Elapsed time: 0.228s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (1 packages loaded, 0 targets configured)
FAILED: Build did NOT complete successfully (1 packages loaded, 0 targets configured)

It now looks for @local_config_platform.

Upvotes: 7

Views: 2024

Answers (1)

erenon
erenon

Reputation: 19118

It appear that bootstrapping bazel from source can solve the issue. After downloading bazel-<version>-dist.zip from GitHub, in the unzipped folder:

env EXTRA_BAZEL_ARGS="--host_javabase=@local_jdk//:jdk" bash ./compile.sh

The compiled output is placed into output/bazel. This is a self-contained Bazel binary, without an embedded JDK.

https://docs.bazel.build/versions/master/install-compile-source.html

Upvotes: 2

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